A) \[24\,cm/{{\sec }^{2}}\]
B) \[12\,cm/{{\sec }^{2}}\]
C) \[6\,cm/{{\sec }^{2}}\]
D) None of these
Correct Answer: C
Solution :
Acceleration \[f=\frac{dv}{dt}=2t,\] then acceleration after 3 second \[\therefore \frac{dA}{dt}=2\pi R\frac{dR}{dt}=1.2\pi c{{m}^{2}}\].
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